Apparatus for measuring the angles of sight.



No. 873,904. A PATENTED DEC. 17, 1907.

- E. SCHNEIDER. APPARATUS FOR MEAfiURZNQTHE ANGLES 0F SIGHT.

APPLICATION FILED A23. 315, 1907.

Fig.2. 1 3g! f piglht, which invention is fully set forth in the 1m es of a vertical graduation and of the By inclining the instrument forward or back- 4 is seen' through the lens 5, on a level with ,To all. whom it may concern:

Republic of France, have'invented a new and asthec reference t5 the accompanying drawing, *in wh1ch:. Flgu're' 1.is' -a longitudinal sectional elevacross sectionon the line B- of Fig. 1. Fig.

cylindrical mirror to be seen andalso the hubcated by the vertical hatching in Fig. 2. The

rotated about a spindle '12 by means of a gear with threads ofthesame'pitch, and which 1 mark in the line of si ht, a liquid level revo- EUGENESCHNEIDER, or LE oREUso r, FRANCE.

errAaA'rUs-non MEASURING THE ANGLES OF SIGHT.

Specification of Letters Patent.

' Patented Dec. 17, 1907.

I Application filed dpril I5, 19Q'7. Serial No 368,273

, Be it known that I, "EUGENE Sonnnrnmt, resident of Le Creusot, Saone-et-Loire, in the useful Apparatus for Measuring Angles of owing specification.

The present invention relates to apparatus for measuring vertical angles, that is to say, angles of sight. The term angle of sight used by artillerists indicates the angle between the line of sight and the horizontal.

The apparatus fulfils the same requirements nometer or eclimeter used in topog.

raphy to measure the inclination of a line proceeding from the apparatus. The arrangeme'nt of the instrument allows the bub 1e} 9f a levelto be brought into juxtaposition with the object or target.

In order that my invention may be clearly understoodand readily carried into effect, I willdescribe the same more fully with tion on the line AA of Fi 3. Fig. Z'is a 3 isa sectionalplan on the line CC of Fig. 1. Ann 1s taken at the object or target directly through the eye-piece 1 and the opening 2.

,ward the image of a line 3 drawn on a mirror theobject and is superposed in the pupil on the image of the object viewed directly. The said lens 5 which is preferably a segmental lens permits? a' graduation 6 marked on a ble of a level 7 viewed by reflection upon the separation surface 8 of two mirrors, which surfacehas been covered for a portion of its width with aslight deposit of silver, as indigraduated mirror 6 is adapted to be rotated around a. spindle 9 by means of a gear wheel 10, which meshes with an endless screw 11. In the same way the level 7 is adapted to bewheel 13 and of an endless screw 14. The endless screws llfland 14 are controlled by the same milled knob 15. They are formed alsorun the same direction.

Ass the apparatus to be directed upon the o ject, and that this object is for example lower than the observer, the bubble will be at-the rear extremity of the level. It is seen after reflection above the horizontal line 3. By turning the knob 15, the level may be rendered horizontal, thereby bringingthe image of the bubble onto the line 3. At the same time the graduation 6 is displaced through the same angle, and when the bubble has been caused to show on the line 3., the division of the graduationfi which is the line 3 indicate the angle of sight opposite The level and the graduated mirror sought.

are turned in the opposite direction in order that the positive angles may be read above zero.' In order to take up the play which may eventually occur in the gearing, the two endless screws 11 and 14 are adapted to berocked around a ball and socket joint 16 under the influence of a spring 17. The openings in the casing areglazed in order to exclude dust. The level 7 may be illuminated by the reflection of the light of the sky upon a small mirror 18 which may be ad justed in any direction.

The apparatus may be held in the hand or placedupon a support of any kind, such asa tripod, a sword, or a stick adapted to receive it: The support need only be provided with a socket adapted to receive the part 19 and form a bayonet joint. Whenthe rod 20 has been fixed to the support, the apparatus may be given all possible movements relatively to this rod by around two spindles 21 and 22 at right angles, the latter spindle passing through the center of gravity of the apparatus.

1. In apparatus for measuring angles of sight or inclination, the, combination of a revoluble graduated cylindrical mirror, a stationary mirror having thereon a guide mark in the line of sight, a liquid level revolubly mounted in the plane of the firstnamed mirror, a I an image ofthe level into the plane of sight, and means for simultaneously rotating said oi. the bubble of the level intothe line'of sight with the guide-mark, object andgrad nation. I

2. In apparatus for measuring angles of sight or inclination, the combination of a rotating it with slight friction third mirror for reflecting cylindrical mirror and level to bring an image 7 revoluble graduated cylindricalv mirror, a

stationary mirror having thereon a guide mirror, a third mirror for reflecting tying the graduations. 3. In an apparatus for measuring angles of sight or inclination, the combination of a revoluble graduated cylindrical mirror, a revolublelevel in the plane of revolution of said mirror, a spring-pressed shaft having two Worm gears and a ball and socket bearing intermediate the said gears to take 11% Wear of the threads and gears meshing Wit said Worms torotate said mirror and level in 0p os ite directions.

n testimony whereof I have signed this specification in the presence of two subscribing Witnesses.

- EUGENE SCHNEIDER.

l/Vitnesses: i

DEAN B. MASON,

DE LAGRANGE; 

